Quadro Chess & Draughts - 4 player

Checkers4 Board Game Review and Rules - Geeky Hobbies

Steam Workshop::Four Player Chess

3 Player Chess Set with Round / Circular Board

Prestigious Wooden Chess Board Large Inlaid Cassette Wooden - Denmark

References

This is a game still sealed in the box. It is a unique game that makes playing chess with 4 persons on 1 special board possible. The game is called

Quadro 4 way chess game in original box ca. 2000's / unique gift for men / vintage gift for him / unopend / Germany

4 Player Chess, Board Game

English draughts - Wikipedia

Four-player chess - Chess Forums

WGR10

4 Player Chess: How To Play And Win